From Oran to Barbès and from Cheikha Remitti to Khaled, Hadj Sameer - collector, DJ and digger - retraces the tumultuous course of raï, whose hits shook the planet in the 1980s and 1990s. Between France and Algeria, a journey in the form of a mythical soundtrack, to the sources of a hybrid and transgressive music that never stops reinventing itself.